reading excel file in ascii format

[hood1]

i am reading excel file with 2 columns and plotting it to a graph.i would like to use AT-MIO-16XE-50 interface card and send these 2 colums to osilloscope.
when i use function generator vi, i can send only one signal to the osillocope but i want to send 2 signal by superposition one signal(column) to the other signal(coloumn). how it works. i am the labview beginner. one example please.thanks

[Michael Philipp]

can you tell me more what you want to do. If you just want to read 2 columns of an excel file, why you don't use "read from spreadsheet file.vi".

[hood1]

Thanks
ok now i am sending the vi. it generates two different
sin waves and after addition of these sin waves i am calling A0 write VI. i can also watch them on Oscilloscope. now my questions are?
1) i can only give one value of amplitude. i would like to give max and min value of amplitude each for both sin waves.
2)how can adjust that this program must run for some fixed time for example 20 hours, and then automatically stops. in which part i have to place the watch?
3) i want to calculate internally period for both of these generated sin waves. how can i calculate the period of a sin in the program and display in indicator.
i am using board AT-MIO-16XE-50
thanks again for any help